Solid laser amplification device

Abstract

A solid laser amplification device having a laser medium that has a solid medium, into which a laser light enters and from which the laser light is emitted, and an amplification layer, provided on the surface of the medium, receives the laser light in the medium, and amplifies and reflects the light toward the exit; and a microchannel cooling part that has a plurality of cooling pipelines, into which a cooling solvent is conducted and which are arranged parallel to the surface of the amplification layer, and a cooling surface, at the outer periphery of the cooling pipelines and attached on the surface of the amplification layer, the microchannel cooling part cooling the amplification layer. The closer the position of the cooling pipeline to a position facing a section of the amplification layer that receives the laser light, the greater the cooling force exhibited by the cooling part.

The invention claimed is: 
     
       1. A solid laser amplification device comprising:
 a laser medium part which has a solid medium, into which a laser light enters from an entrance part and from which the laser light is emitted from an exit part to the outside, and an amplification layer which is provided on a surface of the medium, receives the laser light in the medium, and amplifies and reflects the laser light toward the exit part; and 
 a microchannel type cooling part which has a plurality of cooling pipelines, through which a cooling solvent passes and which are arranged in a direction parallel to a surface of the amplification layer, and a cooling surface which is provided at an outer periphery of the plurality of cooling pipelines and mounted on the surface of the amplification layer, and cools the amplification layer, 
 wherein in the cooling part, a cooling power increases as it goes toward the cooling pipeline provided at a position closer to a position facing a place receiving the laser light, of the amplification layer, 
 wherein each of the plurality of cooling pipelines has a first pipeline extending in a direction approaching the cooling surface, and a second pipeline which is connected to the first pipeline and extends in a direction away from the cooling surface, and through which the cooling solvent from the first pipeline flows. 
 
     
     
       2. The solid laser amplification device according to  claim 1 , wherein in the cooling part, flow velocity of the cooling solvent flowing therein increases as it goes toward the cooling pipeline provided at a position closer to a position facing a place receiving the laser light, of the amplification layer, or a temperature of the cooling solvent flowing-in decreases as it goes toward the cooling pipeline provided at a position closer to a position facing a place receiving the laser light, of the amplification layer. 
     
     
       3. The solid laser amplification device according to  claim 1 , wherein in the cooling part, a direction in which the cooling solvents flow in some of the cooling pipelines is set to be a direction opposite to a direction in which the cooling solvents flow in other cooling pipelines. 
     
     
       4. The solid laser amplification device according to  claim 3 , wherein in the cooling part, flow directions of the cooling solvents in the cooling pipelines adjacent to each other are set to be directions opposite to each other. 
     
     
       5. The solid laser amplification device according to  claim 1 , further comprising:
 a thermally conductive part which is provided in contact with the amplification layer and the cooling surface between the amplification layer and the cooling surface and transfers heat of the amplification layer to the cooling part. 
 
     
     
       6. A solid laser amplification device comprising:
 a laser medium part which has a solid medium, into which a laser light enters from an entrance part and from which the laser light is emitted from an exit part to the outside, and an amplification layer which is provided on a surface of the medium, receives the laser light in the medium, and amplifies and reflects the laser light toward the exit part; and 
 a microchannel type cooling part which has a plurality of cooling pipelines, through which a cooling solvent passes and which are arranged in a direction parallel to a surface of the amplification layer, and a cooling surface which is provided at an outer periphery of the plurality of cooling pipelines and mounted on the surface of the amplification layer, and cools the amplification layer, 
 wherein each of the plurality of cooling pipelines has a first pipeline extending in a direction approaching the cooling surface, and a second pipeline which is connected to the first pipeline and extends in a direction away from the cooling surface, and through which the cooling solvent from the first pipeline flows.